Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

Macabre astrological automaton clock dating to the late 1400s.

This spooky statue sits outside a famous Prague theater.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

A saintly relic hidden in a Prague church basement.

Amsterdam's Red Light District leaves little to the imagination.

After Christopher Columbus died, his son built a fancy house to rule from.

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

Built in 1512, the oldest cathedral in the Americas.

The first hospital in the New World.

A remarkable range of flora and fauna are represented in this Dominican nature preserve.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

One of the two original gateways into the Kasbah, this gateway is a nesting site for storks.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

This Neolithic passage tomb forms part of a World Heritage Site.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.